Start eslint 9 migration

For #230339

Starts migrating to eslint 9. Everything runs but it produces a number of errors

.eslint-plugin-local/code-no-unexternalized-strings.ts

@@ -0,0 +1,160 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as eslint from 'eslint';
+import { TSESTree, AST_NODE_TYPES } from '@typescript-eslint/utils';
+
+function isStringLiteral(node: TSESTree.Node | null | undefined): node is TSESTree.StringLiteral {
+	return !!node && node.type === AST_NODE_TYPES.Literal && typeof node.value === 'string';
+}
+
+function isDoubleQuoted(node: TSESTree.StringLiteral): boolean {
+	return node.raw[0] === '"' && node.raw[node.raw.length - 1] === '"';
+}
+
+export = new class NoUnexternalizedStrings implements eslint.Rule.RuleModule {
+
+	private static _rNlsKeys = /^[_a-zA-Z0-9][ .\-_a-zA-Z0-9]*$/;
+
+	readonly meta: eslint.Rule.RuleMetaData = {
+		messages: {
+			doubleQuoted: 'Only use double-quoted strings for externalized strings.',
+			badKey: 'The key \'{{key}}\' doesn\'t conform to a valid localize identifier.',
+			duplicateKey: 'Duplicate key \'{{key}}\' with different message value.',
+			badMessage: 'Message argument to \'{{message}}\' must be a string literal.'
+		},
+		schema: false,
+	};
+
+	create(context: eslint.Rule.RuleContext): eslint.Rule.RuleListener {
+
+		const externalizedStringLiterals = new Map<string, { call: TSESTree.CallExpression; message: TSESTree.Node }[]>();
+		const doubleQuotedStringLiterals = new Set<TSESTree.Node>();
+
+		function collectDoubleQuotedStrings(node: TSESTree.Literal) {
+			if (isStringLiteral(node) && isDoubleQuoted(node)) {
+				doubleQuotedStringLiterals.add(node);
+			}
+		}
+
+		function visitLocalizeCall(node: TSESTree.CallExpression) {
+
+			// localize(key, message)
+			const [keyNode, messageNode] = (<TSESTree.CallExpression>node).arguments;
+
+			// (1)
+			// extract key so that it can be checked later
+			let key: string | undefined;
+			if (isStringLiteral(keyNode)) {
+				doubleQuotedStringLiterals.delete(keyNode);
+				key = keyNode.value;
+
+			} else if (keyNode.type === AST_NODE_TYPES.ObjectExpression) {
+				for (const property of keyNode.properties) {
+					if (property.type === AST_NODE_TYPES.Property && !property.computed) {
+						if (property.key.type === AST_NODE_TYPES.Identifier && property.key.name === 'key') {
+							if (isStringLiteral(property.value)) {
+								doubleQuotedStringLiterals.delete(property.value);
+								key = property.value.value;
+								break;
+							}
+						}
+					}
+				}
+			}
+			if (typeof key === 'string') {
+				let array = externalizedStringLiterals.get(key);
+				if (!array) {
+					array = [];
+					externalizedStringLiterals.set(key, array);
+				}
+				array.push({ call: node, message: messageNode });
+			}
+
+			// (2)
+			// remove message-argument from doubleQuoted list and make
+			// sure it is a string-literal
+			doubleQuotedStringLiterals.delete(messageNode);
+			if (!isStringLiteral(messageNode)) {
+				context.report({
+					loc: messageNode.loc,
+					messageId: 'badMessage',
+					data: { message: context.getSourceCode().getText(<any>node) }
+				});
+			}
+		}
+
+		function visitL10NCall(node: TSESTree.CallExpression) {
+
+			// localize(key, message)
+			const [messageNode] = (<TSESTree.CallExpression>node).arguments;
+
+			// remove message-argument from doubleQuoted list and make
+			// sure it is a string-literal
+			if (isStringLiteral(messageNode)) {
+				doubleQuotedStringLiterals.delete(messageNode);
+			} else if (messageNode.type === AST_NODE_TYPES.ObjectExpression) {
+				for (const prop of messageNode.properties) {
+					if (prop.type === AST_NODE_TYPES.Property) {
+						if (prop.key.type === AST_NODE_TYPES.Identifier && prop.key.name === 'message') {
+							doubleQuotedStringLiterals.delete(prop.value);
+							break;
+						}
+					}
+				}
+			}
+		}
+
+		function reportBadStringsAndBadKeys() {
+			// (1)
+			// report all strings that are in double quotes
+			for (const node of doubleQuotedStringLiterals) {
+				context.report({ loc: node.loc, messageId: 'doubleQuoted' });
+			}
+
+			for (const [key, values] of externalizedStringLiterals) {
+
+				// (2)
+				// report all invalid NLS keys
+				if (!key.match(NoUnexternalizedStrings._rNlsKeys)) {
+					for (const value of values) {
+						context.report({ loc: value.call.loc, messageId: 'badKey', data: { key } });
+					}
+				}
+
+				// (2)
+				// report all invalid duplicates (same key, different message)
+				if (values.length > 1) {
+					for (let i = 1; i < values.length; i++) {
+						if (context.getSourceCode().getText(<any>values[i - 1].message) !== context.getSourceCode().getText(<any>values[i].message)) {
+							context.report({ loc: values[i].call.loc, messageId: 'duplicateKey', data: { key } });
+						}
+					}
+				}
+			}
+		}
+
+		return {
+			['Literal']: (node: any) => collectDoubleQuotedStrings(node),
+			['ExpressionStatement[directive] Literal:exit']: (node: any) => doubleQuotedStringLiterals.delete(node),
+
+			// localize(...)
+			['CallExpression[callee.type="MemberExpression"][callee.object.name="nls"][callee.property.name="localize"]:exit']: (node: any) => visitLocalizeCall(node),
+
+			// localize2(...)
+			['CallExpression[callee.type="MemberExpression"][callee.object.name="nls"][callee.property.name="localize2"]:exit']: (node: any) => visitLocalizeCall(node),
+
+			// vscode.l10n.t(...)
+			['CallExpression[callee.type="MemberExpression"][callee.object.property.name="l10n"][callee.property.name="t"]:exit']: (node: any) => visitL10NCall(node),
+
+			// l10n.t(...)
+			['CallExpression[callee.object.name="l10n"][callee.property.name="t"]:exit']: (node: any) => visitL10NCall(node),
+
+			['CallExpression[callee.name="localize"][arguments.length>=2]:exit']: (node: any) => visitLocalizeCall(node),
+			['CallExpression[callee.name="localize2"][arguments.length>=2]:exit']: (node: any) => visitLocalizeCall(node),
+			['Program:exit']: reportBadStringsAndBadKeys,
+		};
+	}
+};